Safety regulations for electrical work. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Safety regulations for electrical work. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electrical safety, fire safety

In order to never go from giving first aid to electric shock to being in need of first aid, it is necessary that safety rules become a habit, and not following them would cause a feeling of discomfort. It is not difficult to do this, especially since these rules are quite simple.

The first commandment of an electrician: all tools that are used for the installation and repair of electrical wiring, electrical appliances and devices (pliers, screwdrivers, side cutters, tweezers) must have insulated handles. Violations of the insulating layer (cracks, breaks) are not allowed. It is strictly forbidden to touch the bare ends of the wiring with unprotected hands, repair electrical installation devices and electrical appliances that are energized. De-energizing the network before starting electrical repairs should be as natural as, for example, washing your hands before eating. If suddenly there was a fire of electrical wires under voltage (Fig. 79), in no case should they be filled with water or cut off with your hands - such imprudent promptness will inevitably lead to electric shock.

Safety regulations for electrical work
Rice. 79. Rules for handling burning wires under voltage: a - incorrect actions; b, c - correct actions.

In such a situation, it is necessary to immediately de-energize the line (disconnect the plug connection or unscrew the plugs). The fire should be extinguished with earth, sand, etc., blocking the access of air to it.

When working with power tools, make sure that the insulating sheath on their cords is not damaged; protect them from bending, chafing and moisture. If there is a possibility of damage to the cords during operation, they should be covered with dry boarding, placed in polyethylene pipes or laid under the cover of electrical skirting boards or trim.

Author: Korshevr N.G.

See other articles Section Electrical safety, fire safety.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

New exoplanet search tool launched 08.12.2017

SPRESSO (Echelle Spectrograph for Rocky Exoplanet and Stable Spectroscopic Observations) started its work today - the search for rocky exoplanets and stable spectroscopic observations. It has improved spectral resolution, a wider wavelength range, and is mounted on ESO's Very Large Telescope (VLT) in Chile. Scientists hope to use it to detect fainter traces of planets with masses and Earth-like orbits. This was announced in a press release by the European Southern Observatory (ESO).

It works by measuring shifts in the spectrum of light from stars caused by planetary gravity.

"It's the most advanced object of its kind in the world," said astronomer Didier Queloz of the University of Cambridge, one of those who, in 1995, discovered the first exoplanet orbiting a normal star.

In the early years of exoplanet research, the "radial velocity" method was most often used, because the light from dim planets is too weak to be seen against the glow of their stars. Since an exoplanet revolves around a star, from the point of view of an observer on Earth, as if pulling its star back and forth, the periodic change in the speed of the star is detected as a Doppler shift in the frequency of its glow.

Hundreds of exoplanets have been found this way. But in recent years, this method has given way to the transit method - the detection of a planet when it passes in front of its star and it temporarily dims. Since 2009, NASA's Kepler satellite has detected several thousand exoplanets using this method.

These two methods show different characteristics of the exoplanet. More precisely, both help determine the orbit, but the old one gives information about the mass of the planet, and the transit one about its size.

This has led to the creation of a new generation of spectrographs designed to search for exoplanets, using different methods and covering different wavelength ranges. The previous generation of spectrographs can record fluctuations of about 1 meter per second - for example, Jupiter "shifts" the Sun by 13 meters per second, but the much weaker Earth in this respect only by 9 centimeters per second. ESPRESSO, the latest development in this direction, should be able to capture planets like Earth with a sensitivity of up to 10 centimeters per second or even less. As Francesco Pepe of the University of Geneva in Switzerland said, "We were the first to go crazy enough to make it happen."

An exact analogue of the Earth is probably out of reach yet, but ESPRESSO should be able to detect super-Earths, three to four Earths in mass, that surround Sun-like stars. It can also detect Earth-sized planets around smaller stars.

Other interesting news:

▪ Recreated volcanic lightning

▪ cloud in the universe

▪ Recorded the most powerful burst of energy in space in the time of observation

▪ Coffee - stroke protection

▪ Lefties do more

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Children's scientific laboratory. Article selection

▪ article And everywhere fatal passions, and there is no protection from fate. Popular expression

▪ article Is it true that in 1971 a tribe isolated from the rest of the world for thousands of years was discovered in the Philippines? Detailed answer

▪ Article Simple knot. Travel Tips

▪ article Smoke detector on a phototransistor. Encyclopedia of radio electronics and electrical engineering

▪ article FM receiver 400-450 MHz. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews